公开(公告)号：US20190222848A1

公开(公告)日：2019-07-18

申请号：US16249371

申请日：2019-01-16

Applicant: QUALCOMM Incorporated

Inventor： Yi-Wen CHEN ,  Wei-Jung CHIEN ,  Yu-Chen SUN ,  Li ZHANG ,  Hsiao-Chiang CHUANG ,  Marta KARCZEWICZ

IPC: H04N19/139 ,  H04N19/105 ,  H04N19/176 ,  H04N19/513 ,  H04N19/577

CPC classification number: H04N19/139 ,  H04N19/105 ,  H04N19/176 ,  H04N19/521 ,  H04N19/577

Abstract: Improved systems and methods related to decoder-side motion vector derivation (DMVD), for example, in applying one or more constraints to motion information, such as a MV derived by DMVD, and/or a MV difference between an initial MV and an MV derived by DMVD. These techniques may be applied to any of the existing video codecs, such as HEVC (High Efficiency Video Coding), and/or may be an efficient coding tool in any future video coding standards. In one example, the block size used for DMVD can be restricted. In another example, FRUC bilateral matching can be simplified by not searching outside reference blocks indicated by the original motion vector.

公开(公告)号：US20190116376A1

公开(公告)日：2019-04-18

申请号：US16158033

申请日：2018-10-11

Applicant: QUALCOMM Incorporated

Inventor： Yi-Wen CHEN ,  Yu-Chen SUN ,  Wei-Jung CHIEN ,  Hsiao-Chiang CHUANG ,  Marta KARCZEWICZ

IPC: H04N19/513 ,  H04N19/176

Abstract: Motion compensated prediction using affine motion models can be used to improve coding efficiency. In a practical encoder/decoder, a line buffer is used to store associated data for neighboring blocks. Embodiments of affine model based motion compensated prediction include methods and systems of determining motion vectors for control points that are aware of line buffer storage limitations.

公开(公告)号：US20180270500A1

公开(公告)日：2018-09-20

申请号：US15918789

申请日：2018-03-12

Applicant: QUALCOMM Incorporated

Inventor： Xiang LI ,  Yi-Wen CHEN ,  Jianle CHEN ,  Hsiao-Chiang CHUANG ,  Wei-Jung CHIEN ,  Yu-Chen SUN ,  Marta KARCZEWICZ

IPC: H04N19/52 ,  H04N19/176 ,  H04N19/44

Abstract: Techniques and systems are provided for deriving one or more sets of affine motion parameters at a decoder. For example, the decoder can obtain video data from an encoded video bitstream. The video data includes at least a current picture and a reference picture. The decoder can determine a set of affine motion parameters for a current block of the current picture. The set of affine motion parameters can be used for performing motion compensation prediction for the current block. The set of affine motion parameters can be determined using a current affine template of the current block and a reference affine template of the reference picture. In some cases, an encoder can determine a set of affine motion parameters for a current block using a current affine template of the current block and a reference affine template of the reference picture, and can generate an encoded video bitstream that includes a syntax item indicating template matching based affine motion derivation mode is to be used by a decoder for the current block. The encoded video bitstream may not include any affine motion parameters for determining the set of affine motion parameters.